termiostermios style tty I/O control (and then
only if configured at installation time).
All functions in this module take a file descriptor fd as their
first argument. This must be an integer file descriptor, such as
returned by sys.stdin.fileno().
This module should be used in conjunction with the TERMIOS
module, which defines the relevant symbolic constants (see the next
section).
The module defines the following functions:
[iflag, oflag, cflag,
lflag, ispeed, ospeed, cc] where cc is
a list of the tty special characters (each a string of length 1,
except the items with indices VMIN and VTIME, which are
integers when these fields are defined). The interpretation of the
flags and the speeds as well as the indexing in the cc array
must be done using the symbolic constants defined in the
TERMIOS module.
tcgetattr(). The when argument determines when the
attributes are changed: TERMIOS.TCSANOW to change immediately,
TERMIOS.TCSADRAIN to change after transmitting all queued
output, or TERMIOS.TCSAFLUSH to change after transmitting all
queued output and discarding all queued input.
TERMIOS.TCIFLUSH for the input
queue, TERMIOS.TCOFLUSH for the output queue, or
TERMIOS.TCIOFLUSH for both queues.
TERMIOS.TCOOFF to suspend output,
TERMIOS.TCOON to restart output, TERMIOS.TCIOFF to
suspend input, or TERMIOS.TCION to restart input.